Which of the following is the correct chemical formula for ammonium fluoride?

• A. NH4F
• B. NH4O
• C. NH3F
• D. NH4Cl

Answer: (A)

Verified step by step guidance

1. Identify the ammonium ion, which is a polyatomic ion with the formula \(\mathrm{NH_4^+}\).
2. Recognize that fluoride is the anion derived from fluorine, with the formula \(\mathrm{F^-}\).
3. Combine the ammonium cation \(\mathrm{NH_4^+}\) with the fluoride anion \(\mathrm{F^-}\) to form a neutral compound.
4. Since the charges of \(\mathrm{NH_4^+}\) and \(\mathrm{F^-}\) balance each other one-to-one, the chemical formula is simply \(\mathrm{NH_4F}\).
5. Verify that the other options do not correctly represent ammonium fluoride: \(\mathrm{NH_4O}\) (ammonium oxide), \(\mathrm{NH_3F}\) (incorrect formula), and \(\mathrm{NH_4Cl}\) (ammonium chloride).